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1) A 1,700 kg car moving at 8.0 m/s is stopped by the action

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1) A 1,700 kg car moving at 8.0 m/s is stopped by the action of its
brakes. The work done by the car’s brakes is ____ Joules.
Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places.
Answer:

2) The total energy of a 6.0 kg falling rock is 5000 J. If its potential energy is 1,995 J, the kinetic energy of the rock is ____ J.
Only enter your numerical answer below – do not include units.
Answer:

3) If the kinetic energy of a 3.0 kg falling rock is 3,120 J, the rock’s speed is ____ m/s.
Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places.
Answer:

4) Assume an asteroid is in the shape of a sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 0.8 meters.
Useful information: 1 kg = 1000 g, 1 m = 100 cm, volume of sphere = 4/3 π r3. Remember that the radius of a sphere is equal to half its diameter!
Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places.

 
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